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Computers need to rejoin domain

Why is it that when I move computers from one container to another on a server 2003, all the computers needed to be rejoin to the domain, isn't it automatic once you move a computer it automatically update its records, thanks for the advise

Not sure I understand how that applies to OP's question. KB324949 "Redirecting the users and computers containers in Active Directory domains" might be something to think about going forward to change the default containers for new users & computers, but it sounds like he is trying to move existing computer accounts to a new OU and something goes wrong.

Question: what is happening after you move the computers, that is causing you to think they need to be rejoined to the domain? Is this a single location, or WAN environment that should have AD Sites & Subnets configured? As you say, it should update automatically and not require anything further. If you have more than 1 DC (and every domain should have at least 2 DCs), there's a chance AD replication between them is not working properly and one of the DCs is out of synch. Check the various logs in Event Viewer on your DCs for any problems.

I have created a container for organizational purposes, when I moved the workstations under the computer container everything was OK until the following day when they turn on their computer to login, they said, they are not able to login to the domain, when I rejoin the computer back to the domain everything went OK, all I did was right click on a workstation, click on move, that's it, I'm just wondering why the workstation got kicked out after I move them to a different container not in different DC.
And YES the changes is in the same forest nothing else change except for moving it to another container for organizational purposes